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<p>The code PTC is a library permitting the tracking through beam lines with 
complex geometry. This WEB site is addressed to the user which develops code 
based on PTC. </p>
<p>&nbsp;</p>
<p>PTC's salient point, besides the obvious usage of the Taylor Polymorphism of 
the FPP package in conjunction with normal form theory (also FPP)&nbsp; is its 
usage of the &quot;fibre&quot; as the defining unit of a beam line. In FPP a beam line is 
a link list of fibres. (<a href="fibre.jpg">Drawing here</a>) The fibres central 
purpose is to allow an s-like&nbsp; magnet propagator to behave like an 
independent object when permissible. In particular we can place the magnets 
anywhere in space and they can be shared by different beam lines. (Type LAYOUT 
of PTC, which is a link list of fibres)</p>
<p>The fibre contains:</p>
<ol>
  <li>The fibre contains a pointer to the magnet (type ELEMENT)&nbsp; that 
  inhabits&nbsp; it. The same magnet can be in several fibres due to beam lines 
  sharing magnets or due to recirculation or combination of both. </li>
  <li>it contains a pointer to a type
  <a href="../a_def_frame_patch_chart.htm#CHART" style="text-decoration: none; font-weight: 700">
  CHART</a> which puts the magnet in its <b>desired</b> location. </li>
  <li>pointers to sets of patches. These patches connect the magnets of 
  successive fibres geometrically, energetically (different reference p<sub>0</sub> 
  ) and even temporally (different reference clock). (Short pictorial 
  description <a href="geometry/patching/patching_brief.htm">here</a> to wet the 
  appetite)</li>
  <li>the direction of propagation through the magnet. </li>
</ol>
<p>We now direct the PTC-educated reader towards some useful HTML documentation</p>
<ul>
  <li>Documentation about Geometry in PTC: click <b>
  <a href="geometry/geometry_in_ptc.htm">here</a></b></li>
  <li>Documentation about PILL BOX CAVITY&nbsp; in PTC: click <b>
  <a href="ptc_cavity/index.htm">here</a></b></li>
  <li>Documentation about INTEGRATION_NODE for seeing inside a
  <font color="#00FF00"><b>magnet</b></font>, <font color="#FF0000"><b>full 3d 
  display</b></font>, and <font color="#0000FF"><b>tracking beams</b></font>: 
  click <b><a href="thin_layout/index.htm">here</a></b></li>
  <li>Ever Changing Format Free Script of MADX-XP: click <b>
  <a href="madx/index.htm">here</a></b> </li>
</ul>

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